Talk:Tag:roundabout=turbo

Applicable ways

Page indicates to "Add roundabout=turbo to the same parts as the parts that have junction=roundabout." however if there is no inner closed loop around which it is legal/possible to drive, then there are NO ways eligible to be marked as junction=roundabout, and therefore none to which roundabout=turbo are applicable. This is a real world form of roundabout, but not a valid OSM roundabout; just a bunch of oneway ways. Tools mark non-loop junction=roundabout as errors which people will correct by removing the junction=roundabout, hopefully ensuring oneway=yes is present, and likely completely missing the presence of any roundabout=turbo tag. --Cebderby (talk) 14:19, 11 November 2023 (UTC)

It's an evolution of the roundabout, OSM follows suit. QA tools should adapt to keep up with OSM development, not the other way around! You can indeed regard a roundabout as a bunch of oneway (and priority) ways, together forming the junction type known as a roundabout. BTW Adding roundabout=turbo does not add much information. Theoretically, navigation systems could use it modify navigation instructions, in particular the exit numbering. --Peter Elderson (talk) 15:17, 30 January 2025 (UTC)